Burglar-alarm



(No Model.) Y A 0. M. DAYTON.

BURGLAR ALARM.

No.f540,582. A Patented June 4,1895.

j j, l

N ITE STATES# suRoLAR-ALARM.

SPECIFIGATIQN forming part orf'Lette'rs :Patent No. 540,582, dated June'4, v1895.

Application filed April 25, 1894. l Serial No. 508,955. (Nomodel.)

when released by an attempted intrusion, and" relates more specificallyto alarms of the class above mentioned which are so compactlyconstructed as to be readily carried in thepocket when not in use, andhence are generally denominated pocket'burglar alarms. l

Among the objects of theinvention are to provide asimple, compactY andconvenient'device which may be readily set so as to give an alarm uponany attempted intrusion,

which will require no specialappurtenances in order to set it to guardclosures of variousv kinds, such as doors, windows, transoms, and

Y the like, and which Inay be -so arranged as to guard at the same asmany different doors, windows, and otherV points of possible entrance,as may be desired. j

The invention consists in the matters hereinafter set forth anddescribed and more par ticularly pointed out in the appended claims andwill be readily understood, reference being had to the accompanyingdrawings, in Which Figure lis a top' View of the box, showing the coverthereof raised and exposing the interior mechanism. Fig. 2 is a verticalsection of the closed box in the plane of line 2 2 of Fig. l. Fig. 3 isatop view of a modification, and Fig. 4 is a detail of the constructionshown in Fig. 3.

As shown in said drawings, A designates a sheet metal box, represented,in this instance, as of Oblong, rectang'ular form and having roundedcorners. Rigidly secured within and tothe bottom of said box is a clockmechanism shown as comprising an ordinary clock' able gears connectingthe shaft with an escape wheel E controlled by a vibratory verge F inthe usual manner. Rigidly secured to said verge or its shaft is an armor detent G provided with an upturned end portion g arranged to engage asliding bar H which, is mounted suitably to slide longitudinally in thebox adjacent to the clock mechanism. For thepurpose of this movement ofthe bar H said bar has one end extended through an aperture 1I formed inthe end of the box, while at its other end it is supported in a bearingaperture i" formed in a support I which, in this instance is attached toand rises as a standard from the bottom of the box A, as best shown inFig. 2.

The bar H is provided at a point between its bearings with tWo laterallydirected shoulders h h', here shown as being formed by a .U -shaped bendhzwhich is so located with respectfto the clock mechanism that when thebar H is in a central position with respect to its limits of movementthe detent G will be free to vibrate between said shoulders, but whensaid bar is shifted in either direction from this central position thedetent Will engage yone or the other of the said shoulders.

The bar H is rotatable by hand to place the -bend h2 in either of twopositions in which it may be successively lemployed in different uses ofthe apparatus, but, in order to support the bar H from rotation When ineither of said positions, an arm I extends from the standard I parallelWith the bar H in position forthe bent portion h2 thereof to slidethereon, as' seen in Figs. 1 and 3; but other provision may obviously bemade to secure the same result. As shown, the support I is provided Withtwo stops 2 and i3 which may engage the arms of the bend h2 and limitthe movements ofl the bar H.

` The bar H is of such length as to project say, about one inch outsidethe box when shifted to its outermost limit in the direction of the boxWall through which it protrudes, the Object of this construction beingto enable the device to be set adjacent to a door or the like in suchposition that the opening of the latter will strike the projecting endofthe bar and move it inward for the release of the alarm.

l A second arm G', rigidly secured to the TOO ' cords thereto.

verge F or its shaft, carries at its outer end a ham mer or clapper garranged to play upon a gong J when the verge is oscillated.

In setting the device as so far described, ready for operation, the barH is, by rotating it far enough t0 lift the bend h2 clear of the stoft2, laced in the osition shown in Figs.

P D P The endwise movement of the har I-I pro-y duced by the doorcarries the bar to the position shown in Fig. 3 Where the bend h3 isseen to have been arrested in its movement by the stop In this positionof the bar H the verge arm G is free to play and the gong hammer arm tovibrate so that the gong will be sounded until the clock work mechanismp runs down or is otherwise arrested.

As an additional means of shifting thebar so as to release the verge armG, I attach thereto one or more cords K K which lead out of the boxthrough an aperture a in the box cover, said aperture a being so locatedthat when the cover is closed it will be vertically above the bar H andat some distance to the left (or in the direction in which it isnecessary to shift the bar in order to release the alarm) of the pointof attachment of the These cords may be severally led to various pointsof possible ingress to a room which it is desired to guard, as a door,window, transom, the., and attached thereto in such manner that theopening of any of them will cause a pull on one of the cords. This maybe conveniently accomplished by training the cord through some fixedguide adjacent to the closure, as for instance, through a small screweye supplied with the alarm,or beneath a chair, before attaching it tothe closure.

" In order that the tripping cords may be drawn taut and so adjustedwhen setting the alarm that a very slight pull will release the alarm,the longitudinally sliding bar H is provided in its under side with anotch h3 so located that when the bar I'I is protruded to its greatestextent this notch will engage the under side of the wall of the aperturetin the end of the box and hold the bar from being retracted by a pullon either' of the cords. After the cords have been properly adjusted thebar will be lifted by hand out of engage ment With the notch and pushedin slightly,

but of course not sufficiently to release the detent.

NVhen it is desired to arrange theialarm for carrying in the pocket, thecords K K are unfastened, the cover of the box opened and the cordsdrawn back and coiled within the box. The bar H is then shifted backtoits innermost limit of movement, the U-shaped portion being lifted upso as to pass over the stop 112 and to lie between the stops t2 and z3,in which position the outer end of the bar II will be just flush withthe outer surface of Jthe box. When thus shifted the bar II will preventthe verge arm or detent G from vibrating, and it will, therefore, beunnecessary to allow the clock mechanism to unwind or run down whenarranging the alarm for carrying, while the stop '112 will hold the barH from being accidentally shifted so as to release the alarm mechanism.The stop projection t2 is preferably long enough to touch or proximatethe cover of the box when the latter is closed, as .indicated in Fig. 2,so as to prevent the bend of the bar II from accidentally passing saidstop and allowing the alarm to be sounded, when the device is beingcarried in a Wound u p condition.

As the weight of the device might not be sufficient to prevent the boxfrom sliding upon its support instead of causing the bar I-l to beshifted by a pull upon one of the cords, said box may be secured to thelicor or other support upon which it is placed by any convenient means,but preferably by means of thumb-tacks a2 a2 inserted through holesformed in .the bottom of the box; these tacks being withdrawn from theirapertures and carried loosely in the box when not in use.

I claim as my inventionl. A burglar alarm comprising a casing, a springactuated clock or gear mechanism therein, a hammer actuated by saidmechanism, a gong upon which said hammer is arranged to strike, adetent, and a tripping device comprising a shiftable bar provided with alaterally extended part, and a stop arranged to engage said lateralextension, said bar being rotatable in its bearings to permit itslateral extension to be shifted past said stop, substantially as setforth.

2. A burglar alarm comprisinga casing, a spring actuated clock or gearmechanism therein, a hammer actuated by said mechanism, a gong uponwhich said hammer is arranged to strike, a detent, and a tripping devicecomprising a shiftable bar adapted to be protruded through the casingand arranged to engage said detent when shifted to either its outer orinner position but to release said detent when in an intermediateposition, a cord attached to said tripping device, and means for lockingsaid bar in its inner position and a notch or stop for holding it fromretraction when in its outer `position substantially as set forth.

3. A burglar alarm comprising a casing, a spring actuated clock or gearmechanism therein, a hammer actuated by mechanism, a gong upon whichsaid hammer is arranged to strike, a detent, and a tripping devicecomprising a shiftablc bar adapted to be protruded through the casingand arranged to engage said detent when shifted to either its IOO IIO

outer or inner position but to release said de-. .In testimony that Iclaim the foregoing as \tent, Whenin an intermediate position, a cord myinvention Iafflx my signature in presence ro attached to said trippingdevice, stops arof two Witnesses.

' ranged to arrest said tripping device in each OSCAR M DAYTON of itspositions, means for locking said bar in its inner position and a notchor stop for Witnesses:

vholding it from retraction when at its outer- ALBERT H. GRAVES, mostposition substantially as set forth. TAYLOR E. BROWN.

